Linux操作系统上ADSL拨号上网的方法详解
http://www.cnblogs.com/vijayfly/p/5795917.html
https://www.roaringpenguin.com/products/pppoe/
http://blog.chinaunix.net/uid-26675482-id-4145769.html
http://blog.csdn.net/weixin_35804181/article/details/72902844
http://rpmfind.net/linux/rpm2html/search.php?query=rp-pppoe
http://freecode.com/projects/rp-pppoe
http://blog.csdn.net/doudou02/article/details/6256908
http://download.chinaunix.net/download.php?id=18326&ResourceID=9073
http://blog.csdn.net/lcszndx/article/details/38583247
http://blog.csdn.net/u010624454/article/details/75638165
http://blog.csdn.net/u010624454/article/details/75670012
http://www.linuxidc.com/Linux/2015-03/115454.htm
http://blog.sina.com.cn/s/blog_13f84624a0102v8am.html
http://www.360doc.com/content/15/0511/11/706976_469629183.shtml
http://www.linuxidc.com/Linux/2015-03/115454.htm
http://jingyan.baidu.com/article/11c17a2c70db6df447e39d55.html
http://netsecurity.51cto.com/art/201404/435105_all.htm
http://sec.chinabyte.com/315/13059815.shtml
http://www.linuxidc.com/Linux/2016-03/129164.htm
http://bbs.51cto.com/thread-1478165-1.html
http://os.51cto.com/art/201409/450682.htm
https://www.otrs.com/otrs-free-help-desk/?lang=zh-hans
http://blog.csdn.net/linuxarmsummary/article/details/18698589